[Asterisk-Users] TDM400P power supply

[Rich Adamson]

> I've a problem with a TDM400P digium card. 
> 
> My box has no molex connectors for power supply. Simply has no any power 
> connector, because is not a normal PC) And I need to know if i can use a 
> external supply. But I've several questions:
> 
> 1.- Are both circuits (PCI-power and Phone-line-power) electrically 
> separated?
> 2.- A little voltage difference can create an undesired internal current?
> 3.- What are the current needs for this supply?
> 
> I need the power supply because I want to use both FXS and FXO ports. 
> And I can't use a Y cable, because I've no molex connectors.

Been discussed several times before and you should have found the
answer using google.

The TDM connector is only used for the fxs modules, and then only the
+12 volt lead on that connector (and ground) is actually wired to 
anything on the TDM board. So, there is no conflict with internal 
system voltages.

Yes you can use an external 12 volt power supply.

The 12 volts is only used on the card to generate ringing voltage to
the fxs modules. No ringing, no significant current draw. Just about
any 12 volt supply should do, however I think I'd be looking for 
one that is at least somewhat regulated. No other idea on the power
supply specs.